Cited by 3Stellar, planetary, and galactic studiesAstrophysical Phenomena and ObservationsAstronomy and Astrophysical Research

K2 discovery of a circumsecondary disk transiting EPIC 220208795

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van der Kamp, L., van Dam, D. M., Kenworthy, M. A., Mamajek, E. E., Pojmański, G.·2022·Astronomy & Astrophysics

Abstract

Context. Observations of the star EPIC 220208795 (2MASS J01105556+0018507) reveal a single, deep and asymmetric eclipse, which we hypothesise is due to an eclipsing companion surrounded by a tilted and inclined opaque disk, similar to those seen around V928 Tau and EPIC 204376071. Aims. We aim to derive physical parameters of the disk and orbital parameters for the companion around the primary star. Methods. The modelling is carried out using a modified version of the python package pyPplusS, and optimisation is done using emcee. The period analysis makes use of photometry from ground-based surveys, where we performed a period folding search for other possible eclipses by the disk. Parameters obtained by the best model fits are used to obtain the parameter space of the orbital parameters, while the most likely period obtained is used to constrain these parameters. Results. The best model has an opaque disk with a radius of 1.14 ± 0.03 R⊙, an impact parameter of 0.61 ± 0.02 R⊙, an inclination of 77.01° ± 0.03°, a tilt of 36.81° ± 0.05°, and a transverse velocity of 77.45 ± 0.05 km s−1. The two most likely periods are ~290 days and ~236 days, corresponding to an eccentricity of ~0.7, allowing us to make predictions for the epochs of the next eclipses. All models with tilted and inclined disks result in a minimum derived eccentricity of 0.3, which in combination with the two other known small transiting disk candidates V928 Tau and EPIC 204376071, suggest that there may be a common origin for their eccentric orbits.

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  • There are currently several prime candidates for occulting circumplanetary discs: V928 Tau, EPIC 204376071, and EPIC 220208795.

    “There are currently several prime candidates for occulting circumplanetary discs: V928 Tau (van Dam et al. 2019), EPIC 204376071 (Rappaport et al. 2019), EPIC 220208795 (van der Kamp et al. 2022).”

    From Beyond Circular Eclipsers (BeyonCE) light curve modelling (2024) · cites this paper as van der Kamp et al. 2022

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Authors
van der Kamp, L., van Dam, D. M., Kenworthy, M. A., Mamajek, E. E., & Pojmański, G.
Affiliations
  • Leiden University (NL)
  • Jet Propulsion Laboratory (US)
  • University of Warsaw (PL)
Venue
Astronomy & Astrophysics
Publisher
EDP Sciences
Published
2022-01-28
Volume
658
Pages
A38
ISSN
  • 0004-6361 (ISSN-L)
  • 1432-0746
OpenAlex
W3209483425
Cited by
3
References
81
Citations by year
2025: 1 · 2024: 2
FWCI
0.26
Type
journal article
Language
en
Open access
Locations
  • Astronomy and Astrophysics (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • Leiden Repository (Leiden University) (submittedVersion)
  • Springer Link (Chiba Institute of Technology) (submittedVersion)
  • Data Archiving and Networked Services (DANS) (submittedVersion)
  • arXiv (Cornell University)
Funders
  • National Science Foundation (0908816, 1515927, NAS 5-26555)
  • National Aeronautics and Space Administration (80NM0018D0004, NAS 526555, 526555)
  • Gordon and Betty Moore Foundation (GBMF5490)
  • Ohio State University (AST-1515927)
  • California Institute of Technology (80 NM0018D0004)
  • Villum Fonden
  • Space Telescope Science Institute (NAS5- 26555, 5-26555, 26555)
  • Chinese Academy of Sciences South America Center for Astronomy
  • European Space Agency (80NM0018D0004, NAS 5-26555)
  • European Commission (776403)
  • Chinese Academy of Sciences
  • Jet Propulsion Laboratory (80NM0018D0004)
  • Center for Cosmology and Astroparticle Physics, Ohio State University
  • Science Mission Directorate (80NM0018D0004, NAS 5-26555)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysical Phenomena and Observations
  • Physical Sciences › Physics and Astronomy › Instrumentation › Astronomy and Astrophysical Research
Keywords
transiting exoplanets, disk inclination, orbital eccentricity, orbital elements, period analysis

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